The CopyandPay widget allows merchants to execute a One-click checkout process as outlined at this link below:

This process allows a merchant to pass through previously created tokens when invoking the widget so that the widget can display these stored cards to the user and enable the One-click checkout scenario.

Merchants can send up to 255 tokens in the CheckoutId request for the widget. However we only display the 10 most recent tokens to the shoppers.